In fact, the faster-than-expected uptake of solar has been used as justification by the government for scaling back its feed-in tariffs as renewables are increasingly able to compete with lower subsidies or, in some cases, no subsidies at all.

But even with the lower feed-in tariff rates, schemes are cropping up that offer significant social benefits even beyond any carbon savings. The latest? The BBC reports on a scheme by green energy provider Solarplicity to install solar on 800,000 low-income households in the next five years. Tenants will get lower bills (aided, in part, by smart meters and LED bulbs that are also a part of the deal), while Solarplicity will make money from the feed-in tariff income—and they'll create 1,000 jobs in the process, many of which the company says will go to military veterans.

It's an encouraging sign and an important reminder that not all energy is created equal; if solar can deliver electricity with lower emissions, cost savings to the most vulnerable in society, and jobs to a broader cross section of the public, then surely those are good reasons to target subsidies where they can have a broad impact? Or, at least, to stop subsidizing fossil fuels so we can actually start talking about a real level playing field...